#include<iostream>
#include<vector>
using namespace std;

class Solution {
public:
    int integerBreak(int n) {
        vector<int> dp(n + 1);
        dp[0] = 0;
        dp[1] = 0;
        dp[2] = 1;
        for(int i = 3; i <= n; i++){
            for(int j = 1; j < i; j++){
                // dp[i] = max(dp[i], max(j * (i - j), j * dp[i - j]));
                dp[i] = max(dp[i], max(j * (i - j), j * dp[i - j]));
            }
        }
        return dp[n];
    }
};

int main()
{
    Solution s;
    int n;
    cin >> n;
    cout << s.integerBreak(n) <<endl;
    return 0;
}